Pump.



R. E. HURST.

PUMP.

APPLICATION FILED ocT. I6. I9I3.

Patented Apr. 27,' 1915.

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u @mue-M1601 THE MORRIS PETERS Co.. PHOTO-1.1 rn uA. WASHINGTON4 D. C.

R. E. HURST` PUMP.

APPLICATION FILED OCT. I6, 1913. 1,137,21 1 a Patented Apr. 27, 1915.

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.the walls of this plate are thickened so as en d of eachvby-passis closed by a valve RALPH E. HURSI, 01E WELLINGTON, KANSAS.

PUMP.

Application filed October 16, 1913.

Aand exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. Y

This invention relates to pumps, and more especially to those. having multiple cylinders and multiple Vpistons arranged in tandem; and the object of the same is to provide improved means for guiding the piston rods and the cross heads with which the pitmen rods are connected.

This and other objects are carried out by constructing the machine in the manner hereinafter more fully described and claimed and as shown in the drawings wherein- Figure 1 is a general vertical sectional view of this entire pump and the actuating mechanism therefor, and Fig. 2 is a side elevation of the same. Fig. 3 is an enlarged vertical sectional view of the pump alone, and Fig. 4 is a cross section on the line 4 4 of Fig. 2.

Referring to-the drawings by reference numerals 1 designates the casing of each of several cylinders (three being shown in thev drawings although there may be a greater number) which are preferably alike with the exceptions that will be noted. This casing. may be a rough casting having an axial bore'2 enlarged at onev end as at 3- preferably the lower end-and cored with two by-pass ports or passages 4 connecting -the ends of the casing beyond the extremities of the bore. The extremities of the casingare by preference provided withradial flanges 5 by means of which each casing is connected by bolts 6 with the'casing adjacent. rlhe bottom of the lowermost casing is closed by a plate 7 having an inlet port 8. The top of the uppermost casing is closed by a plate 9 having an outletport 10 and at its center. a large hole l1 around which to produce a'cavity.,for the reception of packing 12-the packing being held in place -by a gland 13 which is secured to the plate bybolts or screws 14. The upper or outlet Specication of Letters Patent.

Patented Apr. 27, 1915.

serial No. 795,503.

15 opening upwardly, and the detailed construction of this valve is not essential. These by-pass passages augment the operation of my pump, in as much as they allow a portion of the water compressed by the moving pistons to be forced through said by-pass passages, into the chamber above eachof the respectiveV pistons, which tends to overcome the dierence in movement between the pistons, and consequently cause the pump to operate a good deal smoother than it would without the use of said passages. Y

The cylinder for each casing may be of different metal, and its bore is nicely turned for the-reception of the piston yet to be de-.

scribed. This cylinder has a truly cylindrical body 16 whose length is a little greater than the bore 2 of the casing 1, whose wall is rather thin, whose external diameter is the same as the internal diameterv of said bore and therefore less than the internal diameter of the bore where it is enlarged as at 3, and whose body has around groove for packing 20, and said body is provided through it with a plurality of ports 21 closed by valves 22 whose detailed construction is not important to this'invention. These valves close downward as do Athe other valves 15 above referred to. Y

The numeral 23 designates a plate secured to the bottom of the body 19 by screws 24 or otherwise and having ports 25 adapted to register with those in the body, and the edge of this plate closes the groove which contains the packing 20 and fitsslidably within the bore of the liner. The plates and pistons areall alike excepting for the difference in the size of their axial holes.

.The means for driving these pistons constitutes one of the features of this invention. Secured in the axialhole 26 of the uppermost member is the lower end of a tubular piston rod 27 which projects slidr ferred to, and the upper end of this rod is connected with a cross head 28 by suitable means as by screwing into the same as y shown. By preference said cross head is provided in its upper face with a cavity for packing 29, and the latter is held in place by a gland which is fastened to the cross head by any suitable means such as screws 31. In similar manner the piston rod 32 is a tube of smallersize whose lower end is connected. with the piston of the intermediate Cylinder, whose body passesy slidably through the bore ofthe tubular piston rod 27 and whose upper end is connected with the second cross' head S23-preferably by the Vsame type of connection as just described. In similar manner the third or lowermost piston is carried by a solid piston rod 84 which preferably passes through the same and receives a nut 35 at its lower Vend, the body of this rod passing through the smaller tubular pitman rod 32 and projecting at its upper end and connecting with the third'or upper cross head 36.

YThe guides for the several cross heads are of peculiar construction and fori'n an essential feature of the present invention. That is to say the first which is the lowest and longest-cross head 28A extends through the upright slots in four guides 40, 41, 42, and 43, the larger tubular piston rod 27 being vconnected with the center of the cross head and its ends being suitably connected by pitman rods 44 and 45 with two cranks 46 and 47 on a power shaft 48. rIhe next shorter Y cross head 38 extends through the two innermost guides 41 and 42, the smaller tubular piston rod 32 being attached to the Vcenter of this cross head, and its extremities being connected by pitman rods 49 andV 50 with two other cranks 51 and 52 on said shaft 48, these cranks being disposed 120o from the first-mentioned cranks 46 and 47. The third, which is thek shortest and' highest, cross head 86 has its extremities sliding between the guides 41 and 42 but not projecting beyond them where they might interfere with' the pitman rods 49 and 50. 'Io the center of this cross head is connected the uppervend of the solid piston rod 34, and is pivoted a single pitman rod 53 which connects with another crank 54 on the power shaft 48, this crank being disposed .120o from either of the other pairs of cranks so that the disposition of the three sets of cranks is one-third away from eachother as shown.

The action of this pump is as follows: The

tween Veach of the casings as clearly shownV V1n Fig. 3 if the latter is descending or forced 1 into the Vby-pass passages 4 in that casing if its piston is ascending; On the descent of any piston head its valves openand water is admitted through the ports 21. Valves 15 prevent the setting back or downward fiow of water through the by-pass passages 4. 21 in the several piston heads are arranged `in alinement with eachother so that there By preference the various perforations is a straight upward course for the water V from the inlet to the outlet end of the entire pump. Where the solid piston rod 34, slides within the inner tubular rod 32 and the `latter within the outer tubular rod 27, little if any lubrication is necessary because at each stroke of the pump these various rods are bathed in'water and friction and heat will therefore'n'ot occur, any more than it would where the packing 2O slides within the liner. Where the various cross heads slide within their guides, lubrication may be necessary as common in machines of this class. Access to the interior of any casing is readily had by removing the bolts 6 connecting its flanges 5 with'pthe next casings or with the end plates 7 or 9, and removing this member entirely. I would suggest that a complete pump might have four such members, and when one becomes defective or Vworn it can be bodily removed andreplaced so that the action of the pump may be continued uninterruptedly while the defective member is repaired. I apprehend, however, that 'the most wear will'occur within'the liner which in time mustv be removed to replace it or to replace the packing 20. This is accomplished by removing this member, then withdrawing the Vbolts or screws 18which hold the liner in place, and pulling the liner out of the bore of the casing l-replacingthe saine with a new liner, and then replacing the member. I donot wish to be-limited to the sizes or materials'of parts, anjd changes in 'details may be made without departing from the principle of the invention'.y

What is claimed as new is:

1. In a pump, a casing having a tubularY bore andV provided with a ,seriesV of by-pass passages, 'each having their extremities in Vcommunication therewith, valves at the upper extremities of said by-pass passages. and` a plurality of valved pistons concentrically Y mounted and movable relatively within-said isc bore and operating in conjunction with said by-pass passages substantially as and for the purposes set forth.

2. In a pump, a casing having a tubular bore and provided with a series of by-pass passages extending longitudinal of the* bore, the latter having their extremities communicating with said bore, a valve at the upper extremity of each of said passages and a plurality ofl valved pistons concentrically mounted and movable relatively within said bore and operating in conjunction with said passages, substantially as and for the purpose as set forth.

3. In a pump, a casing having a tubular bore, and provided with a plurality of valved pistons, concentrically mounted and movable relatively within the latter, a plu-v l bore and having their extremities'communicating with the latter above and below each of said liners, valves operatively disposed at the upper extremities of said bypass pass ages and a piston dis osed in each of said liners, said pistons emg concentrically to coperate with said by-pass passages substantially as and for the purpose set forth.

6. In a multiple cylinder pump, a plurality of casings each having a tubular bore and also provided with by-pass passages around the bore affording communication between the end portions of the casing, annular flanges formed on the extremities of said casings, the flanges of the respective casings being secured together to connect said casings in tandem, a bottom plate removably secured to the flange at the lower end of the lowermost casing and having an inlet port therein, a top plate removably secured tothe upper flange of the uppermost casing and having an outlet port therein, and pistons mounted for reciprocation respectively in the bores of said casings.

In testimony whereofr I have hereunto set my hand in presence of two subscribing witnesses.

RALPH E. I-IURST. Witnesses:

CHAs. P. HANGER, Gmo. E. Hamaorferr.Y

Copies of this patent may be obtained vfor ve cents each, by addressing the Commissioner of Patents,

. Washington, D. C. 

